Half of U.S. soybeans exported to China this year would not meet Chinese rules for routine delivery in 2018, according to shipping data reviewed by Reuters, signaling new hurdles in the $14-billion-a-year business. More stringent quality rules, which take effect on Jan. 1, could require additional processing of the U.S. oilseeds at Chinese ports to remove impurities. This could raise costs and reduce sales to the world's largest soybean importer, according to U.S. farmers and traders. read more